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(No Model.)

0. H. POND &'A. SMMUNGER.

SECONDARY ELECTRIC TOWER GLOUK.

No. 305,632. Patented Sept. 23, 1884.

Y INVENTOR w a UiwsierZZPolLd v By their flttorneys 9 nger.

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A UNiTnn STATES CHESTER H. POND, OF NEW YORK, AND ALFRED S. MUNGER, OF BROOKLYN,

PATENT Ocarina-O ASSIGNORS TO THE TIME TELEGRAPH COMPANY, OF NE YORK, N. Y.

SECONDARY ELECTRIC TOWER-CLOCK.

LJPECIPICATION forming part of Letters Patent No. 305,632, dated September 23, 1884.

Application filed September 24, 1883. (No model.)

To It whom it may concern..-

Be it known that we, Cnnsrnn H. Penn and ALFRED S. llIUNGER, citizens of the United States, residing, respectively, in New York, in the county and State of New York, and in Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Secondary Electric Towcr-Cloeks, of which the following is aspect fication.

The object of our invention is to produce a movement for secondary electric clocks which shall not be liable to be too rapidly advanced under the successive impulses imparted to the driving-wheel, nor subject to a retrograde movement when released from the' retaining click or dog. Such provisions are especially desirable in secondary electric clocks designed to control the movements of heavy hands, such as are employed for towerclocks.

The invention consists in organizing the mechanism as follows: The driving-wheel of a secondary electric clock of usual construction is provided with a detaining click or dog, which normally engages the teeth of the wheel, thus preventing an accidental movement of the same. The forward movement of the driving-pawl, however, first causes this click to be disengaged from the teeth of the wheel through the agency of a trippingdevice, thus permitting an advance of the same. The click, is then allowed to fall against the next tooth in such manner as to enter the succeeding space when the wheel has completed its advance movement. The moment the click e11- ters this space it is momentarily locked therein, thus effectually preventing it from being thrown out by a rebound. The return of the pawl to its former position causes the same to engage the succeeding tooth, and the tripping device to be placed in a position to repeat the operation at the next forward movement of the pawl.

In the accompanying drawings,whioh illustrate our invention, Figurel is a front elevation of the clock mechanism, and Fig. 2 is a side elevation of the same. Fig. 3 illustrates certain details in the construction of the locking device.

Referring to the drawings, A. represents a train of wheels adapted to revolve the hands of the clock before adial in their proper relative periods. The driving-wheel b of this train is preferably constructed with square teeth I),

and arranged to be advanced step by step by means ofa pawl, O. This pawl is pivoted upon an armature-lever, c, of an electro-inagnet, E. The electro-magnet E is designed to be included in circuit with any suitable device for" completing and interrupting the connections of a battery with the proper frequency for propelling the hands in their required periods.

The movements of the wheel I) are checked by means of a dog or click, E, which is carried uponan arbor, f, and normally forced toward the wheel by means of a coilspring, G, surrounding the arbor. One end of this spring is fastened to the dog and the other attached to the frame of the mechanism, and it acts, in a manner well understood, to force the click in the direction indicated by the arrow. So long as the dog engages the wheel the latter is pre vented from moving in either direction, and itis evident that the wheel must be disengaged from the dog before it can be advanced by the action of the pawl. This end is accomplished by means of a tripping device, G, which consists of a plate, attached to the arbor f, and carrying a detent, 9", upon its upper surface.

A latch or hooked pawl, g", is pivoted to the armature-lever, and carries at its end a catch or hook, g, which is adapted to fall behind the projection when the lever is in its backward position, and the dog or click F engages the When, however, the arwill be observed, however, that a slight for- 0 ward movement of the lever and pawl must take place before the wheel is freed from the dog. This may be provided for either by causing the pawl to normally fall back at each movement a slight distance farther than is 5 necessary to engage the succeeding tooth, and thus allow it to subsequently move asnfficient distance forward before striking that tooth to accomplish the desired result; or the dog may be constructed to permit the necessary ad vancement by forming the engagingstop of less thickness than the width of the space between two successive teeth, thus permitting a slight movement of the wheel, notwithstanding the engagement of the click. The former method, however, is preferable.

For the purpose of causing the dog or click F to assume the required position for engaging the wheel immediately after they latter has ad- 'vanccd a sufficient distance to carry the space in which the click previously rested beyond its reach, the latch g is constructed with an extension, h, which rests upon an arm, it, of the detent 5 As the arbor is revolved by the action of the lever and driving-pawl, the arm 7i serves to raise the extension It, thus lifting the latch out of engagement with the detent. The dog is then again impelled toward the wheel and strikes against the face of the sac ceeding tooth. The continued advancement of the wheel under the influence of the pawl causes thistooth to pass from beneath the dog, which thereupon falls into the succeeding space, effectually preventing the wheel from advancing more than one tooth. The time during which the dog is held away from the wheel is necessarily so short that it would be practically impossible for the wheel to ad vanec more than one tooth at each movement of the ar m atu re-l ever. i

For the purpose of further provid i ng against an accidental displacement of the dog, a locle ing device is provided for holding the dog in engagement with the wheel when the pawl is in its forward position. This device consists of a stop, 7., carried upon the arbor-f, and an arm, 7. which is pivoted to the frame of the mechanism and rests upon an arm, 75, extending from the lever c. A bevelfaced projection, In, is formed on the under side of thearni Jr, and by resting atits thicker portion upon the arm 75 serves to normally hold the arm I." out of the path of the stop or block In. \Vhemhowever, the lever is moved forward, the arm It moves along the under surface of the bevel-faced projection k", and thus permits the arm 7." to fall. As soon as the lever and driving-pawl have advanced a sufficient distance to permit the dog to again engage the teeth of the wheel, the arm 7.: falls behind the stop or block 7., thus elt'ectir ally preventing the dog from rebounding.

\Ve claim as our invention- 1. The combination, substantially as hereinbefore set forth, with the train mechanism of an electric clock, of a driving-pawl for ad vancing and a dog or click for engaging the same, a hooked pawl moving with said driv lug-pawl, an arm moving with said click, and means, substantially such as described, for causing said hooked pawl to successively cngage and release said arm at each forward movement of said drivingmwl.

2. The combination, substantially as here inbefore set forth, of a toothed wheel, a pawl and lever for actuating the same, a dog or click for locking the same, a tripping device acting to momentarily disengage said dog from said wheel. during the advance movement of said pawl, and a locking device serving to lock said dog between the teeth of said wheel when it again engages the same.

2' The combination, substantially as here inbeforc set forth, with the train mechanism of an electric clock, of a retaining click or dog applied to one of the wheels of said mechair ism, and a locking device serving to lock said click between the teeth ot'snid wheel when it first engages the same.

l. The combination, substantially as hereinbefore set forth, with the driving'whcel of an electric clock, of a pawl for advancing the same step by step, which pawl is constructed to receive an initial advance movement between the teeth of said wheel witlniut actual ingthe same, and alockingpawl for said wheel, which is actuated duringsuch initial. movement.

5. The combination, substantially as here inbcfore set forth, of the wheel I), the pawl U, the lover a, the deg F, and the tripping device (It.

6. The combination, substantially as hereinbefore set forth, of the wheel I), the pawl the lever c, the deg F, the tripping device it, and the locking-lever I.", block Ir, arm If", and projection in.

In test imony whereof we have hereunto subscribed our names this 22d day of September, A. 1). 186:}.

CHESTER 11'. POND. ALFRED HUNGER.

lVitncsscs:

DANIEL W. Encnr on n, (nannies A. Tn'nnv. 

